High-capacity friction draft-rigging.



W? I. F. OCONNOR.

,'HIGH CAPACITY FRICTION DRAFT RIGGING.

' .A AVPQLICATION FILED DEC.9, 1914.

Pmemedsepf. 10, 1918.

2 SHEETS- SHEET l.

` A TTORNE Y I. F. OCONNOR. HIGH CAPACITY' rmcnoN DRAFT memo.

APPLICATION FILED DEC-9.19m. I

' Patented Sept. 10, 1918.

2 SHEETS-SHEET 2.

QL ATTORNEY UNITED STATES PATENT orricii.

vJOHN F. VocoNNoii, F- cHICAGo, ILLINOIS, AssIGNon To WILLIAiiil H. `iiiINiiia., 0FI

, y ciIAzY', NEW YORK.

HIGH-CAPACITY FKRICTION DRAFT-RIGGINGQ Specification of Letters Patent.

Patented sept. io, 191s.

Application led December 9, 1914. Serial No. 876,216.

To all whom zt may concern: l

v tion Draft-Rigging, ofwhich the following is a full, clear. concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification. l

This invention relates to improvements in high capacity friction draft rigging.

An object of the invention 1s to provide a friction draft rigging for railway ,ca rs 'having a very high capacity and a certain release.

The invention furthermore consists iii the improvements in the parts and devices and.

in thenovel combinations of the parts and" devices, as herein f shown, described or claimed.

. In the drawing forming a part of this specification, FigureI 1 is a vertical sectional view of a diaft rigging embodying my improvements, parts being shown in side elevation. Fig. 2 is a horizontal sectional view of the structure shown in Fig 1 and taken on the line 2--2 thereof, the gear being shown under full buff.` Figs. 3 and 4 are lvertical sectional views taken on the line 3--3 and 4-4 respectively of Fig. 1, and Fig. 5 is a detail, broken, sectional view illustrating another form or embodiment of my improvements.

In said drawing, and referring to Figs. 1 to 4 inclusive, 10-10 denote the center sills, to which are attached rear stops 11 and front stops 12,"the latter having also limiting stops 13. Mounted between the sills is a combined friction cylinder and spring casing A, the front portion 14s' of which constitutes the friction cylinder and the rear portion 15 the spring casing, the latter having a-n integral rear follower 16 formed therewith. Surrounding the member A is a yoke 17 having a hooded end 1S at the front thereof, thc' side walls of which are provided withv elongated slots 19 through 4whicheii- .tends a couplerrkey 2O to connect said yoke -with tlieldraw bar 21, the end of the draw bar abutting a front follower 22. Mounted within the friction cylinder 14, ismy improved arrangement of friction devices Which, as shown, constitutes a plurality of circularly arrangedfriction shoes 23 having outer cylindrical friction surfaces 24 coacting with the inner cylindrical surfaces 25 of the cylinder; an auxiliary or secondary set of wedges 26 circularly arranged and mounted within the shoes 23, the auxiliary wedges having cylindrical outer surfaces 27 contacting the inner cylindrical surfaces 28 foi-ined on the inner sidesof the shoes 23; a main wedge or spreader 29 having inclined wedging faces 30; antifriction rollers 31 mounted between the wedging faces 30 of the main Wedge and1 correspondingly in.-`

clined wedge faces 32'on the inner sides of the auxiliary wedges 26; a block' or follower 33 interposed between the front follower 22 and the ends of theauxiliary wedges 26'; and an auxiliary spring '34 interposed between the inner'ends of the auxiliary wedges 26 and inwardly'extending fianges 35 on the inner ends of the friction shoes 23. The

main wedge 29, as shown, is provided with an .integral spring follower 36 between which and the rear wall of the'casting A is interposed the main spring consisting of an outer ceil 37 and an inner coil'38. The rear wall of the casting A is also provided with an inwardly extending,'hollow, .perforated boss 39 through which extends a connecting bolt 40, the latter having the head thereof seated in a recess in the block 33, it being understood that the bolt 40 passes through a suitable perforation in the main wedge 29. The bolt 40 maintains the parts in assembled position and the springs under initial compression.

The normal position of the parts is as shown in Fig. l, wherein the front follower 22 is spaced a short distance, say half an inch, from the outer ends of the friction y shoes 23. TheA block 33 1s interposed ber tween the follower 22 and the auxiliary' wedges 26, which latter are pressed 'forwardly under the action of the springs 34,

37 and 3S. Upon inward movement of the,v

draw bar, thel front follower presses the tional resistancebetween the outer surfacesv thereof and the friction surfaces ofthe'cyl ion f' scribed what -l now consider llie lpreferreil `I'einliodiinentiof,my invention. it will he iin- ,f to such a 4'point that the front follower confacts with the outer ends of vthe friction BEST AvAiLAeLE coP f ,aider-j Marthe from fiiowr 22b`10ck 3:;

,fand wedges 26 have been moved inwardly shoes 23, then the blocki33, auxiliary Wedges 2li and shoes 23 all more inwardly without relative movement and the frictional resistance is increased by the main wedge which .is resisted by the 'main spring and which acts through the antifri'ction rollers, auxiliary wedges and frictionfshoes to force the latter into greater frictional contact with the inner surface of the friction cylinder `1l,l

thisn'ioveinent being continued untily the front follower' is stopped by engagement with the limiting stops 13 and the? front end ofthe casting A.

Under release, the auxiliary wedges 2G will first be forced outwardly by the springs 34, 3'and 38, the friction shoesl remaining stationary during the 'initial portions of the release. After the auxiliarywedges 2 6 and vmain wedge 29 have moved outwardly to such an extent that the follower 36 engages vthe innerends ofthe friction shoes, the latter will then begin to more outwardly, which movement continues until the parts assume their full release position. Under draft, it will be understood that the same sequence of actions takes place, except that the castring A is the part which moves and the and antifriction rollers 31.

.miii'l'esepawate from the wedge. In place of v`the blocle` i3 shown in Figs, 1 to4`, a block H133 is provided, which has an outer flange moved slightly inwar llyf, ='engages'k the outer ends of the ,shoesdl instead ofthe v` latter being directly engaged-hv the front follower. The operation is similar to `that above described for the coiisti'iugtion shown ,in Figs. 110,4. i

parent that tliedevice which l havedeigiied* provides fokiiv an exceedingl y `high 'i ,frictionall resistance; and one in which tli'e llinglpf, thrust from theuedgi` to the shoes to the friction cylinder. iiiay-l he vasired, .the load on `tlifeiiiiain vedge -dei-stood,thatl changes and iiiodilicalions jnniyfhe in i'ide in 'the details and arrange- 'ri'nts of parts, such for instance as the omisand front follower 22 are held staomgt'he/preceding descripffon," it will )eing limited to ktherpressurejof ythe sion of the spring 'Therefore44 I do not wish ,to heliinited to the structiii'e hei-cin defy scribed in detaihbut contemplate all changes andinodilication tliat'como within the scope of the claims appended hereto. I

I cla.im:` 1. In a draft rigging a friction gear comprising a friction shell,

a main wedge, a spring, friction shoes ha \'-y ing friction,surfaces on theexterior thereof cooperating with the friction surfaces of said shell, said friction shoeshaving' also interior ,wedge engaging surfaces, and a set of auxiliary wedges having outer hearing surfaces coperable with the said inner .surfaces of the friction shoes, said main wedge' actingdirectly against said spring.'

In a draft rigging for railway cars, a friction gear comprising a friet-ion shell, a main spring, a main wedge, auxiliary wedges, and friction shoes, the friction shoes acting directly against the frictionl shell and the auxiliary'wedges against'the friction shoes, the latter remaining stationary relative to the shell during initial action of buff and draft, and; an 'auxiliary for railway cars.

sofi! spring interposed between the friction shoes and the ,auxiliary wedges.

3. In a draft rigging for railway cars, a] 1 A friction ear comprising afriction shell, a main wedge, shoes coperable 4with said shell, .a set of auxiliary wedges interposed between the main wedge and the friction shoes, said friction shoes remaining stationary rrelati\'e to the shell during initial action of hufi' and draft, a follower, and means for transmitting pressure from said follower first directly to the auxiliary lset of wedges and finally to said wedgesan'd the friction shoes simultaneously. l

4. In a draft rigging for railway cars,

the combination with a follower, of a iiiov- ,able friction shell, friction -,shoes eoperablef, i with said shell and having their front ends ,extended; outside ofthe shell but normally a main spriiioga set of friction spaced from said follower", a spring within said shell, wedge acting means interposed between said shoes and said spring. said means con'iprising vmain and auxiliary "shoes, and means interpo` edlietween the followerand thev auxiliary wedges; for triinslff mitting the pressureto-'thc latter prior lo tion slioes.l

ln a friction draft'. ge

the pressure being ytransmitted to t'lie`fiie r, the co Ahina annularly arranged friction shoes, coiliperalilo with said shell, a .set vof annularly' :ir-"

ranged auxiliary wedges i-o`i|ieiiililerwilli said shoes, a niain wedgezaiid spring` iiieans resisting inoveiiienl,ol'said shoes aud'ivi'dges, said auxiliary wedges being iii'ovable longiwedgcs, an 'auxiliaryspring interposedlietweentlie auxiliary wedgesand the friction i tion with a friction shell. of a plurality:ofA

iso Y tudinally of the shell anal relatively to the friction shoes during initial portions of buffing movement. 'f

6.,111 ai friction ydraft gear, the combinay tion' with a friction shell, oa plurality of friction shoes sliflable longitudinally there of, a nainv spring, a main Wedge directly engaging" said spring,v a pluralityv of auxiliary Wedges/interposed between Said main Wedge'and said shoes, anti-friction rollers vinterposed between said main and auxiliary Wedges, and. means engaging said auxiliary Wedges fori-actuating the latter independently of tliesslioes during initial portions of the actuation of the gear.

7; In @shock absorbing mechanismr of the Vcharacter'tlescribed, the combination' with@ combined friction shell and spring casing,

on shell and coacting with the interior agplurality of friction Mshoes Within vthe "i BEST AvAiLABLE @Op lsurface of the letter,V said friction shoes being normally. extended partly beyond the end of the friction shell, a Series of auxiliary Wedges Within and `coactingwith the friction shoes, the number of auxiliary wedges corresponding to the number of fric tion shoes, va 'main Wedge coaoting with the 'auxiliary wedges,` spring Ineens directly resisting movement of the main Wedge, and means for transmitting pressureprimerily to the auxiliary Wedges prior to application of pressure to the friction shoes whereby 4the auxiliary .ifedges have a preliminary 

